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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

LENNOX HEARTH PRODUCTS  •  MERIT PLUS

®

 B-VENT GAS FIREPLACES (MPB33/35/40/45)  •  CARE AND OPERATION INSTRUCTIONS

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing 

property damage, personal injury or loss of life. 

A. This appliance has a pilot which must be lighted by a piezo 

igniter.  When lighting the pilot, follow these instructions 

exactly.

B. BEFORE LIGHTING smell all around the appliance area for 

gas. Be sure to smell next to the floor because some gas is 

heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS:
•  Do not try to light any appliance.

•  Do not touch any electric switch; do not use any phone in your 

building.

1.  STOP! Read the safety information above on this label.
2.  (If applicable) Set the thermostat to lowest setting. Turn wall on/off 

switch, unit mounted on/off switch or remote control switch "OFF."

3.  Turn OFF all electric power to the appliance.
4.  Access the control compartment.
5.  Push in gas control knob slightly and turn clockwise              to "OFF."  
   NOTE: Knob cannot be turned from "PILOT" to "OFF" unless knob is 

pushed in slightly.  Do Not force.

6.  Wait five (5) minutes to clear out any gas.  Then smell for gas, 

including near the floor.  If you smell gas, STOP! Follow "B" in the 

safety information above on this label.  If you don't smell gas, go to the 

next step.

7.  Find pilot - located in firebox on the same plane as the top of the burner.
8.  Turn knob on gas control counterclockwise               to "PILOT."
9.  Push in control knob all the way and hold in.  Immediately light the pilot 

by triggering the piezo igniter (pushing the button) until pilot lights.  

Continue to hold the control knob in for about 1-1/2 minutes after the 

pilot is lit.  Release knob and it will pop back up.  Pilot should remain 

lit.  If it goes out, repeat steps 5 through 9.

•   If knob does not pop up when released, stop and immediately call 

your service technician or gas supplier.

LIGHTING INSTRUCTIONS

TO TURN OFF GAS TO APPLIANCE

•   If the pilot will not stay lit after several tries, turn the gas control 

knob to "OFF" and call your service technician or gas supplier.

10. Turn gas control knob counterclockwise             to "ON."
11. Close control compartment.
12. (If applicable) Turn on all electrical power to the appliance.
13. (If applicable) Set thermostat to desired setting. Turn wall on/off switch, 

unit mounted on/off switch or remote control switch "ON."

WARNING

HOT GLASS WILL  CAUSE BURNS.

DO NOT TOUCH GLASS  UNTIL COOLED.

NEVER ALLOW CHILDREN TO TOUCH GLASS.

•  Immediately call your gas supplier from a neighbor’s phone. 

Follow the gas supplier’s instructions.

•  If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. 

Never use tools. If the knob will not push in or turn by hand, 

don’t try to repair it, call a qualified service technician. Force 

or attempted repair may result in a fire or explosion.

D. Do not use this appliance if any part has been under water. 

Immediately call a qualified service technician to inspect the 

appliance and to replace any part of the control system and 

any gas control which has been under water.

4. 

Push in gas control knob slightly and turn clockwise              to "OFF."  Do 

not force.

5. Close the main line gas shut-off valve.

6. Close control compartment.

Pilot Assemblies

H I

LO

W

TPTH

TP

TH

PIL

OT

PI

LO

T

ON

it

OFF

OUT

IN

LO

HI

IN

OUT

OFF

PILO

T

ON

PILOT

ON

OFF

PI

LO

T

L

O

HI

HI

L O W

HT

PT

HT

PT

PILO

T

PIL

OT

ON

ti

OFF

OUT

IN

Gas Control Valves

SIT

Robertshaw

Gas Control Knobs

Honeywell

P/N 62L2901_5

1. (If applicable) Set the thermostat to lowest setting. Turn wall on/off 

switch, unit mounted on/off switch or remote control switch "OFF." 

2. 

 Turn OFF all electric power to the appliance, if service is to be 

performed.

3. 

Access the control compartment.

LIGHTING INSTRUCTIONS - MILLIVOLT GAS VALVE

Summary of Contents for MPB-35

Page 1: ...ng property damage personal injury or death WARNING AVERTISSEMENT AVISO HOT GLASS WILL CAUSE BURNS DO NOT TOUCH GLASS UNTIL COOLED NEVER ALLOW CHILDREN TO TOUCH GLASS UNE SURFACE VITRÉE CHAUDE PEUT CAUSER DES BRÛLURES LAISSER REFROIDIR LA SURFACE VITRÉE AVANT D Y TOUCHER NE PERMETTEZ JAMAIS À UN ENFANT DE TOUCHER LA SURFACE VITRÉE EL VIDRIO CALIENTE CAUSARÁ QUEMADURAS USTED DEBE NUNCA TOCAR EL VID...

Page 2: ...s Controls Control Compartment Access 8 Variable Flame Height Adjustment 9 Vent Operation Test and Resetting The Safety Limit Switch 9 Maintenance 11 Front Glass Enclosure Panel Removal and Installation 12 Install Volcanic Stone Glowing Embers and Logs 13 Burner Flame Appearance Sooting 17 Burner Flame Adjustments 18 Millivolt Appliance Checkout 18 Electronic Appliance Checkout 18 Wiring Diagrams ...

Page 3: ...oir Page 5 Lisez la section Informations importantes relatives à la sécurité Page 4 Toutes les parties de votre foyer Lennox Hearth Products deviennent EXTRÊMEMENT CHAUDES Instale una malla o barrera física para evitar el contacto directo con el vidrio y prevenir las quemaduras y lesiones graves Ver los detalles a la izquierda para ordenar un Lennox SAFETY GUARD GRATIS para su chimenea Siga las in...

Page 4: ...s peuvent subir des brûlures s ils viennent en contact avec la surface chaude Il est recommandé d installer une barrière physique si des personnes à risques habitent la maison Pour empêcher l accès à un foyer ou à un poêle installez une barrière de sécurité cette mesure empêchera les tout petits les jeunes enfants et toute autre personne à risque d avoir accès à la pièce et aux surfaces chaudes 8 ...

Page 5: ...uptor opera la chimenea encendiéndola y apagándola Limpie bien la placa del interruptor de pared para quitar el polvo y aceite Pegue la etiqueta en la superficie de la placa del interruptor que controla la chimenea Figura A Seleccione el idioma que más se habla en la casa 2 Si se usa un control remoto para controlar la chimenea encuentre el transmisor y límpielo bien para quitar el polvo y aceite ...

Page 6: ...r assistance or additional information consult a qualified installer service agency or the gas supplier AVERTISSEMENT Une installation un réglage une modification une réparation ou un entretien mal effectué peut causer des dommages matériels ou des blessures Voir la notice de l utilisateur qui accompgne l appareil Pour de l aide ou des renseignements supplémentaires consultez un installateur un te...

Page 7: ...d gas pressure requirements Inlet Gas Supply Pressure Fuel Minimum Maximum Natural Gas 4 5 WC 1 12 kPa 10 5 WC 2 62 kPa Propane 11 0 WC 2 74 kPa 13 0 WC 3 24 kPa Table 2 The appliance and its appliance main gas valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psi 3 5 kPa The appliance must be isolated from th...

Page 8: ...ter HI LO flame adjustment knob pilot and main gas ON OFF control knob and gas valve Figure 1 are located behind the lower access panel On electronic systems the hi lo flame adjustment knob and gas valve are located behind the lower access panel To remove the lower access panel slide the hinge pin on the left side of the panel to the RIGHT until it disengages from the left corner post hole Pull th...

Page 9: ...mit switch perform the following steps NOTE Allow the appliance to cool com pletely 1 Remove the top louver panel 2 Reset the safety limit switch by pushing the red reset button located between the wire terminals on the back of the switch See Figure 4 Detail A 3 The appliance should then relight and re main lit NOTE If the appliance does not relight turn off the appliance and call for a qualified ...

Page 10: ...n Page 12 5 Remove the three 3 screws securing the lintel and then remove the lintel One of the lintel cabinet top holes is shown in Figure 4 Detail B 6 Remove the three 3 screws securing the scoop and then remove the scoop see Figure 4 Detail B 7 Remove the two 2 screws securing the safety switch bracket and remove the switch bracket assembly with low voltage wires attached through the side panel...

Page 11: ...ing ATTENTION Au moment de l entretien des commandes étiquetez tous les fils avant de les débrancher Des erreurs de cáblage peuvent entraîner un fonc tionnement inadéquat et dangereux Inspect and clean all wire connections Ensure that there is no melting or damage Inspection should include Terminals at the valve ON OFF Switch optional unit mounted switch or standard CPI switch electronic models on...

Page 12: ...igned to operate only when the front glass enclosure panels are installed Generally the front glass enclosurepanelshouldnotberemovedexceptto gainaccesstothecomponentswithinthefirebox REMOVING GLASS ENCLOSURE PANELS Remove the top louver assembly To access the glass door securing latch first open the lower control compartment door Figure 5 by pushing in simultaneously the left and right top corners...

Page 13: ...volcanic stone should be placed directly on top of the firebox bottom along the front and to the back at the right and left sides of the burner Position any optional ceramic fiber liners before placing the volcanic stone Logs should be positioned after the volcanic stone NOTE This appliance is provided with enough glowing embers for several applications do not feel compelled to use all that is in ...

Page 14: ... with the log s notches directly over the brackets Position the right log log no 3 by inserting the pin from the rear log into the hole on its upper end Place the left log and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notches directly against the grate All top logs that rest on lower logs do so over flattened mou...

Page 15: ...e placed in the order shown Position the rear log on the brackets at the rear of the firebox with the log s notches directly over the brackets Position the right log log no 3 by inserting the pin from the rear log into the hole on its upper end Place the left log and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notc...

Page 16: ... Position the individual logs as shown below Logs should be placed in the order shown Position the center log on the burner first then place the glowing embers as shown in Figure 7 Place the rear log both the right and left and then the smaller left and right top logs All logs that have notches to fit over the grate tines should be positioned with these notches directly against the grate All top l...

Page 17: ...r opening must be adjusted between these two extremes Air Shutter Adjustment Guidelines If there is smoke or soot present first check the log set positioning to ensure that the flames are not impinging on any of the logs If the log set is properly positioned and a sooting condition still exists then the air shutter opening should be increased Themoreoffsetsintheventsystem thelarger the air shutter...

Page 18: ...mentally to a more closed position until the proper flame appearance is achieved 4 When satisfied that the burner flame appearance is normal turn the ON OFF control unit mounted or remote switch depending on your application to the OFF position 5 Reinstall the lower control access panel then proceed to finish the installation Millivolt Appliance Checkout To light the burner rotate the gas valve co...

Page 19: ...WITCH WALL SWITCH OR REMOTE CONTROL RECEIVER A B H C T I W S T I M I L WT BK BK BK Schematic Representation Only Figure 19 Wiring Diagram Electronic Gas Valves P N 580491 01 JUNCTION BOX 120V AC REMOTE RECEIVER ON OFF SWITCH WALL SWITCH LIMIT SWITCH B VENT MODELS ONLY AC DC POWER ADAPTOR HOT NEUTRAL OPTIONAL GROUND BATTERY HOLDER DFC WIRE HARNESS SPARK WIRE CABLE PILOT GROUND WIRE PILOT SENSOR CAB...

Page 20: ...Low Battery Detection Remote Control The life of the remote control batteries depends on many factors including battery quality and number of appliance ignitions When the transmitter batteries are low the LED light will be dim to alert of a low battery condition before losing all power As soon as the depleted batteries are replaced the Transmitter will restart its normal operation Low Battery Dete...

Page 21: ...e Remote Simple On Off Cat No Model No Description H8840 KIT RC G FIRE Remote Control Cost Effective Solution Simple On Off operation Workswithmillivoltandlowvoltageelectronic ignition controls Kit includes Remote and Receiver Remote Two Button Timer On Off Or Timer Mode Cat No ModelNo Description H8860 RC S 1 Remote Control Wall Control 4 button timer with 30 60 120 OFF minutes Wall surface mount...

Page 22: ...thout duct FOAK 4LD for use if outside combustion air is required or desired If model FOAK 4LDisuseditmustbeusedinconjunction with locally purchased non combustible Class 1 or Class 0 flexible duct Outside Combustion Air Kits Cat No ModelNo Description 81L87 FOAK 4 Combustion Air Kit with duct 81L88 FOAK 4LD Combustion Air Kit without duct Style View Doors Style View doors come in three styles The...

Page 23: ...t the vent system at the top and at the base within the firebox for signs of blockage or obstruction Look for any signs of dislocation of the vent components reconnect or replace as necessary Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed in this manual Replace Glowing Embers Homeowner Qualified Services Technician Remove old ember mat...

Page 24: ... repeat steps 5 through 9 If knob does not pop up when released stop and immediately call your service technician or gas supplier LIGHTING INSTRUCTIONS TO TURN OFF GAS TO APPLIANCE If the pilot will not stay lit after several tries turn the gas control knob to OFF and call your service technician or gas supplier 10 Turn gas control knob counterclockwise to ON 11 Close control compartment 12 If app...

Page 25: ...t La veilleuse devrait rester allumée Si elle s éteint répétez les étapes 5 à 8 inclusivement Si la manette ne se soulève pas d elle même lorsqu on la relâche arrêter et appeler immédiatement un technicien qualifié ou le fournisseur de gaz Si la veilleuse ne reste pas allumée après plusieurs tentatives réglez la manette d admission du gaz à la position OFF et appelez un technicien qualifié ou le f...

Page 26: ...ult in a fire or explosion D Do not use this appliance if any part has been under water Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water Electronic Gas Control Valve SIT Electronic Pilot Assembly 3 Turn off all electric power to the appliance if service is to be performed NOTE The c...

Page 27: ... peut avoir une batterie de secours installer les batteries au besoin 8 Placez l interrupteur du récepteur en position REMOTE ou l interrupteur mural en position ON 9 Si applicable Appuyez sur le bouton ON OFF pour sélectionner ON 10 Si applicable Ajustez le thermostat sur la télécommande à l ajustement désiré 11 Si l appareil ne se met pas en marche suivez les instructions intitulées Comment coup...

Page 28: ...e the limit switch Disconnect the wires from the ON OFF switch and the valve label wires for reattachment Test for continuity with a multimeter If continuity is not indicated switch is de fective and must be replaced Wall switch or wires defective Check wall switch and wires for proper connections Jumper wire across terminals at wall switch if burner comes on replace defective wall switch If okay ...

Page 29: ...a service technician if required Pilot flame is not engulfing the sensor Call a service technician Obstructed vent system Call a service technician Soot is present on the glass and panels Initial fireplace operation A white film may develop on the glass during the first few fires as part of the burn in process The first few times you use the fireplace clean the glass after each use AFTER THE GLASS...

Page 30: ...rner Natural Gas 99K74 1 60J80 1 99K76 1 24M10 1 11 Orifice Main Burner LP Gas 99K78 1 19L52 1 21L01 1 37G00 1 12 Bag Of Embers Rockwool 88L53 1 88L53 1 88L53 1 88L53 1 13 Bag Of Decorative Volcanic Stone 80L42 1 80L42 1 80L42 1 80L42 1 14 Gas Line Flexible Connector 93L32 1 93L32 1 93L32 1 93L32 1 15 Safety Limit Switch High Limit Disc 62L16 1 62L16 1 62L16 1 62L16 1 WARNING Failure to position t...

Page 31: ...LE LENNOX HEARTH PRODUCTS MERIT PLUS B VENT GAS FIREPLACES MPB33 35 40 45 CARE AND OPERATION INSTRUCTIONS Replacement Parts 7 4 11 5 14 9 40 45 9 33 35 17 16 10 40 45 33 35 10 12 13 19 18 20 22 21 23 25 24 31 1 2 3 8 40 45 33 35 8 15 29 30 28 27 6 ...

Page 32: ...ices and also to discontinue colors styles and products Consult your local distributor for fireplace code information LENNOX the LENNOX design DAVE LENNOX the image of DAVE LENNOX and other related LENNOX marks are registered or common law trademarks of Lennox Industries Inc and are used with permission Printed in U S A 2012 Lennox Hearth Products LLC P N 506017 04 Rev D 04 2013 1508 Elm Hill Pike...

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